Here's a thought, I'm sure you can find a friend or family member who's a bit of a wood-worker, the walls are 2x2" framed with 1/4' plywood or Masonite panelling but if you were to make a plate say 6" by the length of the handrail you need out of a matching hardwood nicely sanded with a small ogee routered around it stained and lacquered to match your interior and using PPL or a similar construction adhesive literally glue it to the wall using a few screws where the handrail bracket will cover the heads to hold it in place until the glue sets, the loading put on the handrail will be spread out over the entire wood plate instead the six to 9 wood screws of the handrail bracket and provided nobody attempts to slide down it or ties a 130LBS Rottweiler to it that set-up should offer more than enough support! "Da Bears"
Red Green:
Nothing bugs a handyman more than a
stripper that works too slow.